This is a good prank to pull on people at school. The computers at school are all connected on the school network. If you do this right it will send messages to people continually.
Step 1: Open Notepad
First you need to open the notepad that is usually located in the start menu under accessories.
Step 2: The Actual Prank Step
net send library11
be sure to type without the "".
Library11 is a computer name be sure this is right or else this will not work. You can also change the haha because that is just a message that will show up.
Step 3: Save and Use
Now save on the desktop and be sure to save as a .bat file or it will show up as a text file and will not work. Now just click on it and it will continually send messages to the designated computer.